Coating composition



Patented June 30, 1 9 36 irate STATES Plrrweme 0 Earl W. Gardner, Harry Roden, and Dudley H. Felder, Port Neches, Tex., assignors to The Texas Company, New York, N. Y., a corporation of Delaware No Drawing. Application January 30, 1934, Serial No. 708,964

Claims. (01. 10631) This invention relates to a coating composiduced at a maximum temperature of about 500 tion particularly useful for coating materials F. to an asphalt of 185 to 200 F. melting point which are to be subjected to severe physical and a penetration at 77 F. (A.S.T.M.) of from stresses, for example, underground pipe lines, 25 to 35.

5 cables, and the like. The cycle asphalt and uncracked asphalt are A product for this purpose should have a liqp erab y redu ed s p y to a melting point, old or semi-liquid consistency at elevated temsuch that the blended materials will have the peratures but should have a relatively high meltde ed d e o T e inert mineral ing point and a low penetration even at elevated filler is then added to the base in the proportion 10 temperatures. Furthermore, there should be no of approximately 10% to 50% of the final prod- 10 tendency to flow at ordinary temperatures and not and the materials are mixed to a uniform after application the material should be sufiisist y r ady for app a n t und r und ciently hard to resist soil stresses and the roots p p t e i From 30% to 45% of th of trees, shrubs, or other vegetation at any norfiller is preferred. The filler is preferably in the mal temperatures. While the material must be form of a fine powder, a material screened l5 sufiiciently hard to resist outside forces, it must through 209 s Screen being Preferred fo t e also be adhesive, tough and have sufficient plipu p seability to be resistant to shock, in other words, it The pr t p d n ac rdance with the must not be brittle. above disclosure has been found to be sufiiciently A product, meeting the above conditions, is hfetlgi to be resistant to S011 stresses and yet [20 20 provided in accordance with the present invenhave the requisite toughness and adhesiveness to tion. The preferred coating material is formed p e t it from being Shattered d br e om of from 50% to 75% of an asphalt base and from e coated Surface in The following is a to 50% of a mineral filler, such as clay-like yp a exa p e f e tests u On t e ma materials of the type of fullers earth, bentonite, ate l herein des b d: 5 infusorial earth, powdered contact clay, or finely Asphalt base 60% ground silica, talc or slate, and the like, or a Cycle asphalt"; 85% combination of these fillers, referred to herein Petro eum a p alt u c a d-" as inert mineral fillers.

The preparation of a suitable asphalt base is 5 5 123 3322 ''g g 3 30 essential in that the base is required to bond the Ductmty at F 0 particles of the filler together to avoid disinte- Penetration at 15i; 2 gration of the coating. The asphalt base may be Penetration at F 2 formed of 50% to 95% of reduced cycle asphalt, Penetration at 6 the remainder being uncracked petroleum as- 35 phalt, air blown or otherwise reduced to the de- Obviously, y d fi OHS and Va at n sired melting point and penetration, It i preof the invention, as hereinbefore set forth, may

ferred to use from 75% to 85% of cycle asphalt be a Without departing from the p t a d in the base but this proportion is not essential. 600136 thereof, and therefore y S h imita- 40 h cycle asphalt referred t herein is t tions should be imposed as are indicated. in the 40 residue from the usual cracking operation ppended claims. charged with distillate oils, such as pressure gas We claim! oil. The pressure tar produced from the crack- A coatlng composition c nsistin of a major ing operations may be reduced with steam, or proportlonef ycle a p a lesser p p o air blowing, or both, to a cycle asphalt of apof substantially uncracked petroleum asphalt and proximately the proper melting point and penefrom 1 to of fin y ivi d mineral tration, a melting point (ball and ring) of about filler- 193 F, being preferred. 2. A coating composition formed of an asphalt The uncracked asphalt, referred to herein, is base comprising to cycle asphalt and an uncracked petroleum residuum, reduced in 5% to 30% of uncracked petroleum asphalt a d 50 atmospheric or vacuum stills to about 600 F. embodying a finely divided mineral filler.

flash. Distillates of gasoline, kerosene, pressure 3. A coating composition comprising an asgas oil and lubricating distillate are removed p t ba and an inert mineral filler, said asoverhead, the residuum being transferred to a phalt base embodying pressure tar produced as converter where it is air blown and/or steam rea residuum from cracking operations charged 55 with distillate oil and uncracked petroleum residuum, said pressure tar and petroleum residuum being separately reduced to high melting point products.

4. A coating composition comprising an asphalt base and a mineral filler, said asphalt base embodying reduced pressure tar, produced as a residuum from cracking operations charged with distillate oil, and uncracked petroleum residuum air blown to a relatively low penetration and high melting point.

5. A coating composition formed of approximately 60% of an asphalt base and 40% of a filler selected from the group consisting of fullers earth, silica and talc, said asphalt base comprising approximately 85% cycle asphalt and 15% uncracked petroleum asphalt. 

